WO2004066882A1 - A mobile bearing knee replacement assembly and a tibial component and a bearing insert therefor - Google Patents

A mobile bearing knee replacement assembly and a tibial component and a bearing insert therefor Download PDF

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Publication number
WO2004066882A1
WO2004066882A1 PCT/AU2004/000075 AU2004000075W WO2004066882A1 WO 2004066882 A1 WO2004066882 A1 WO 2004066882A1 AU 2004000075 W AU2004000075 W AU 2004000075W WO 2004066882 A1 WO2004066882 A1 WO 2004066882A1
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WO
WIPO (PCT)
Prior art keywords
bearing insert
assembly
curved
tibial component
shape
Prior art date
Application number
PCT/AU2004/000075
Other languages
French (fr)
Inventor
Ronald Mark Gillies
William Walsh
Original Assignee
Unisearch Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unisearch Limited filed Critical Unisearch Limited
Publication of WO2004066882A1 publication Critical patent/WO2004066882A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/38—Joints for elbows or knees
    • A61F2/3868—Joints for elbows or knees with sliding tibial bearing

Definitions

  • the present invention relates to a mobile bearing knee replacement assembly and a tibial component and a bearing insert therefor.
  • the invention has been primarily developed for total knee replacement surgery and will be described hereinafter with reference to this application. However, the invention is also applicable to partial (ie. uni-compartmental) knee replacement surgery.
  • Known mobile bearing knee replacement assemblies have three main components: a metal femoral component; a plastic bearing insert; and a metal tibial component (known as a tibial tray).
  • the femoral component is adapted for fixing to the bottom of the femur.
  • the tibial tray is adapted for fixing to the top of the tibia.
  • the bearing insert is positioned between the femoral and tibial components. The mating or bearing surfaces between the underside of the bearing insert and the top of the tibial tray are flat.
  • a disadvantage of known mobile bearing replacement components is that, during some knee movements (eg. walking), one condyle can lift off from the bearing insert. This leads to increased stresses between the bearing insert and the remaining condyle in contact, and a corresponding increase in wear of the components.
  • most mobile bearing mechanisms use either a metal post or peg upstanding from the tibial tray that inserts into a recess in the bearing or a plastic post or peg depending from the bearing that inserts into a recess in the tibial tray. These arrangements can allow excessive bearing mobility or lift of the femoral component, which can lead to impingement of the bearing insert (either on the metal post or peg or plastic post) and accelerated wear of the knee assembly. These arrangements also restrict the kinematics of the knee assembly design and result in less than ideal loading to the tibial tray (ie. edge loading).
  • the present invention provides a mobile bearing replacement knee assembly including: a tibial component having a convexly curved superior surface; and a bearing insert having a concavely curved inferior surface, wherein the curved surfaces of the tibial component and bearing insert are, in use, adapted for slidable engagement relative to each other.
  • the curved surfaces of the tibial component and bearing insert are substantially conforming in shape with each other.
  • the tibial component surface is curved in the mediolateral plane and is most preferably part cylindrical in shape. In a preferred form, the tibial component surface is curved in the mediolateral and anteroposterior planes and is most preferably part ellipsoid or part spherical in shape.
  • the bearing insert surface is curved in the mediolateral plane and is most preferably recessed part cylindrical in shape. In a preferred form, the bearing insert surface is curved in the mediolateral and anteroposterior planes and is most preferably recessed part ellipsoid or recessed part spherical in shape.
  • the present invention provides a tibial component for a mobile bearing replacement knee assembly, the tibial component having a convexly curved superior surface.
  • the tibial component surface is curved in the mediolateral plane and is most preferably part cylindrical in shape.
  • the tibial component surface is curved in the mediolateral and anteroposterior planes and is most preferably part ellipsoid or part spherical in shape.
  • the present invention provides a bearing insert for a mobile bearing replacement knee assembly, the bearing insert having a concavely curved inferior surface.
  • the bearing insert surface is curved in the mediolateral plane and is most preferably recessed part cylindrical in shape
  • the bearing insert surface is curved in the mediolateral and anteroposterior planes and is most preferably recessed part ellipsoid or recessed part spherical in shape.
  • the present invention provides a mobile bearing replacement knee assembly including: a tibial tray having a convexly curved superior surface; and a bearing insert having a concavely curved inferior surface that substantially mirrors the tibial tray's convexly curved superior surface.
  • the present invention provides a mobile bearing replacement knee assembly including: a metal tibial tray having a convexly curved superior surface; and a plastic bearing insert having a concavely curved inferior surface that substantially mirrors the tibial component's convexly curved superior surface.
  • Fig. 1 is an exploded perspective view of a first embodiment of a mobile bearing replacement knee assembly according to the invention
  • Fig. 2 is mediolateral side view of the tibial component shown in Fig. 1 ;
  • Fig. 3 is an anteroposterior side view the tibial component shown in Fig. 1;
  • Fig. 4 is an anteroposterior side view of a second embodiment of a tibial component
  • Fig. 5 is an exploded perspective view of a second embodiment of a mobile knee replacement assembly according to the invention, which utilises the tibial component shown in Fig. 4;
  • Fig. 6 is an assembled perspective view of the knee replacement assembly shown in Fig. 1 ; and Fig. 7 is an assembled anteroposterior view of the replacement knee assembly shown in Fig. 1.
  • a mobile bearing knee replacement assembly 10 includes a Cobalt Chromium femoral component 12, a polyethylene bearing insert 14 and a Cobalt Chromium tibial tray 16.
  • the femoral component 12 is substantially identical to present conventional components of this type and will not be described hereinafter in any further detail.
  • the superior surface 18 of the bearing insert 14 is also similar to present conventional components of this type and will not be described hereinafter in any further detail.
  • the inferior surface 20 of the bearing insert 14 is concavely curved in both the mediolateral and anteroposterior planes.
  • the inferior side of the tibial tray 16 includes a locating stem 22 and is also similar to present conventional components of this type and will not be described hereinafter in any further detail.
  • the superior surface 24 of the tibial tray 16 is convexly curved in both the mediolateral and anteroposterior planes. As best shown in Fig.
  • the surface 24 has a constant radius of curvature R in the mediolateral plane, which is preferably 200mm. As best shown in Fig. 3, the surface 24 is also curved along a constant radius of curvature R' in the anteroposterior plane, which is preferably 200mm. In the assembly 10, the radii of curvature R, R' are equal which results in the surface 24 being overall part spherical in shape.
  • the inferior surface 20 of the bearing insert 14 substantially conforms to the shape of the superior surface 24 of the tibial tray 16.
  • the knee replacement assembly 10 is shown assembled and implanted in a knee joint between the femur F and tibia T in Figs. 6 and 7.
  • the inferior surface 20 of the bearing insert 14 makes slidable bearing contact with the superior surface 24 of the tibial tray 16.
  • the curved surfaces 20 and 24 allow extra degrees of freedom (ie. translation and rotation in the mediolateral and anteroposterior planes) between the bearing insert 14 relative to the tibial tray 16. This results in the assembly 10 maintaining a larger contact area during more ranges of knee movement, which lowers contact stresses and leads to reduced component wear.
  • the assembly 10 also allows for full contact between the femoral component 12 and the bearing insert 14 during the condyler lift off (reportedly l-2mm) phase of gait. Tins improves the kinematics of the knee assembly 10 and decreases the amount of wear induced on the bearing surfaces 20 and 24.
  • the curved surfaces of the femoral component 12 and the bearing insert 14 also provide an increase in the contact area between these components, thereby also decreasing stress magnitude.
  • Fig. 5 shows a second embodiment of a mobile bearing knee replacement assembly 40.
  • Like reference numerals will be used to indicate like features to those shown in the first embodiment.
  • the assembly 40 is similar to the assembly 10 except the inferior surface 42 of the bearing insert 14' and the superior surface 44 of the tibial tray 16' are both curved in the mediolateral plane only. Accordingly, when viewed from the mediolateral side, the superior surface 44 of the tibial tray 16' appears identical to that shown in Fig. 2. However, when viewed from the anteroposterior side there is no curvature which results in the surface 44 being part cylindrical in shape, as shown in Fig. 4.
  • the second embodiment of assembly 40 possesses the advantages described above in relation to the assembly 10 except the curved surfaces 42 and 44 only allow translation and rotation in the mediolateral plane.
  • assemblies 10 and 40 avoid edge loading of the bearing inserts 14, 14' and the tibial trays 16,16' due to the relative movement (ie. translation as well as rotation) that the bearing inserts 14, 14' can make on their respective tibial trays 16, 16'.
  • Another advantage is that the additional degrees of freedom more closely replicate the natural kinematics of the knee and also allows some self correction of the positioning of the three components, particularly during compression of the knee. This is because, during compression and shear and torsional loading of the knee assembly, the bearing insert can follow the radius of curvature and translate as well as rotate relative to the tibial tray.
  • assemblies 10 and 40 represent only a relatively minor manufacturing change (ie. changing two flat surfaces to two curved surfaces) for existing component manufacturers and thus enables them to utilise existing: component geometry; bone fixation systems; and installation instrumentation.
  • the invention has been described with reference to preferred embodiments, it will be appreciated by a person skilled in the art that the invention may be embodied in many other forms.
  • the curved inferior surface of the bearing insert and the curved superior surface of the tibial tray are not closely conforming in shape.
  • Other metals can also be used for the femoral and tibial components as well as ceramic femoral components or coatings.
  • the radii of curvature R, R' differ which results in the superior surface of the tibial tray being overall part ellipsoid in shape.

Abstract

A mobile bearing replacement knee assembly (10). The assembly (10) includes a tibial component (16) having a convexly curved superior surface (24) and a bearing insert (14) having a concavely curved inferior surface (20). The curved surfaces (24, 20) of the tibial component (16) and bearing insert (14) are, in use, adapted for slidable engagement relative to each other.

Description

A MOBILE BEARING KNEE REPLACEMENT ASSEMBLY AND A TIBIAL COMPONENT AND A BEARING INSERT THEREFOR
Field of the Invention
The present invention relates to a mobile bearing knee replacement assembly and a tibial component and a bearing insert therefor.
The invention has been primarily developed for total knee replacement surgery and will be described hereinafter with reference to this application. However, the invention is also applicable to partial (ie. uni-compartmental) knee replacement surgery.
Background of the Invention Known mobile bearing knee replacement assemblies have three main components: a metal femoral component; a plastic bearing insert; and a metal tibial component (known as a tibial tray). The femoral component is adapted for fixing to the bottom of the femur. The tibial tray is adapted for fixing to the top of the tibia. The bearing insert is positioned between the femoral and tibial components. The mating or bearing surfaces between the underside of the bearing insert and the top of the tibial tray are flat.
There are various known mechanisms for allowing some limited movement of the bearing insert relative to the tibial tray, hence the characterisation: "mobile bearing". These mechanisms allow the bearing to slightly rotate, or slightly rotate and translate in the anteroposterior direction, relative to the tibial tray.
A disadvantage of known mobile bearing replacement components is that, during some knee movements (eg. walking), one condyle can lift off from the bearing insert. This leads to increased stresses between the bearing insert and the remaining condyle in contact, and a corresponding increase in wear of the components. Further, most mobile bearing mechanisms use either a metal post or peg upstanding from the tibial tray that inserts into a recess in the bearing or a plastic post or peg depending from the bearing that inserts into a recess in the tibial tray. These arrangements can allow excessive bearing mobility or lift of the femoral component, which can lead to impingement of the bearing insert (either on the metal post or peg or plastic post) and accelerated wear of the knee assembly. These arrangements also restrict the kinematics of the knee assembly design and result in less than ideal loading to the tibial tray (ie. edge loading). Object of the Invention
It is an object of the present invention to substantially overcome or at least ameliorate the above disadvantages and/or to provide mobile bearing knee replacement components with improved knee kinematics.
Summary of the Invention
Accordingly, in a first aspect, the present invention provides a mobile bearing replacement knee assembly including: a tibial component having a convexly curved superior surface; and a bearing insert having a concavely curved inferior surface, wherein the curved surfaces of the tibial component and bearing insert are, in use, adapted for slidable engagement relative to each other.
Preferably, the curved surfaces of the tibial component and bearing insert are substantially conforming in shape with each other.
In one form, the tibial component surface is curved in the mediolateral plane and is most preferably part cylindrical in shape. In a preferred form, the tibial component surface is curved in the mediolateral and anteroposterior planes and is most preferably part ellipsoid or part spherical in shape.
In one form, the bearing insert surface is curved in the mediolateral plane and is most preferably recessed part cylindrical in shape. In a preferred form, the bearing insert surface is curved in the mediolateral and anteroposterior planes and is most preferably recessed part ellipsoid or recessed part spherical in shape.
In a second aspect, the present invention provides a tibial component for a mobile bearing replacement knee assembly, the tibial component having a convexly curved superior surface. In one form, the tibial component surface is curved in the mediolateral plane and is most preferably part cylindrical in shape. In a preferred form, the tibial component surface is curved in the mediolateral and anteroposterior planes and is most preferably part ellipsoid or part spherical in shape.
In a third aspect, the present invention provides a bearing insert for a mobile bearing replacement knee assembly, the bearing insert having a concavely curved inferior surface.
In one form, the bearing insert surface is curved in the mediolateral plane and is most preferably recessed part cylindrical in shape, hi a preferred form, the bearing insert surface is curved in the mediolateral and anteroposterior planes and is most preferably recessed part ellipsoid or recessed part spherical in shape. In a fourth aspect, the present invention provides a mobile bearing replacement knee assembly including: a tibial tray having a convexly curved superior surface; and a bearing insert having a concavely curved inferior surface that substantially mirrors the tibial tray's convexly curved superior surface. hi a fifth aspect, the present invention provides a mobile bearing replacement knee assembly including: a metal tibial tray having a convexly curved superior surface; and a plastic bearing insert having a concavely curved inferior surface that substantially mirrors the tibial component's convexly curved superior surface.
Brief Description of the Drawings
Preferred embodiments of the invention will now be described, by way of examples only, with reference to the accompanying drawings in which:
Fig. 1 is an exploded perspective view of a first embodiment of a mobile bearing replacement knee assembly according to the invention;
Fig. 2 is mediolateral side view of the tibial component shown in Fig. 1 ;
Fig. 3 is an anteroposterior side view the tibial component shown in Fig. 1;
Fig. 4 is an anteroposterior side view of a second embodiment of a tibial component; Fig. 5 is an exploded perspective view of a second embodiment of a mobile knee replacement assembly according to the invention, which utilises the tibial component shown in Fig. 4;
Fig. 6 is an assembled perspective view of the knee replacement assembly shown in Fig. 1 ; and Fig. 7 is an assembled anteroposterior view of the replacement knee assembly shown in Fig. 1.
Detailed Description of the Preferred Embodiments
(Note: In all drawings, the letters M, L, A and P are used to denote the medial, lateral, anterior and posterior sides of the knee respectively). Referring to the drawings, there is shown a first embodiment of a mobile bearing knee replacement assembly 10. The assembly includes a Cobalt Chromium femoral component 12, a polyethylene bearing insert 14 and a Cobalt Chromium tibial tray 16.
The femoral component 12 is substantially identical to present conventional components of this type and will not be described hereinafter in any further detail. The superior surface 18 of the bearing insert 14 is also similar to present conventional components of this type and will not be described hereinafter in any further detail. The inferior surface 20 of the bearing insert 14 is concavely curved in both the mediolateral and anteroposterior planes. The inferior side of the tibial tray 16 includes a locating stem 22 and is also similar to present conventional components of this type and will not be described hereinafter in any further detail. The superior surface 24 of the tibial tray 16 is convexly curved in both the mediolateral and anteroposterior planes. As best shown in Fig. 2, the surface 24 has a constant radius of curvature R in the mediolateral plane, which is preferably 200mm. As best shown in Fig. 3, the surface 24 is also curved along a constant radius of curvature R' in the anteroposterior plane, which is preferably 200mm. In the assembly 10, the radii of curvature R, R' are equal which results in the surface 24 being overall part spherical in shape.
The inferior surface 20 of the bearing insert 14 substantially conforms to the shape of the superior surface 24 of the tibial tray 16.
The knee replacement assembly 10 is shown assembled and implanted in a knee joint between the femur F and tibia T in Figs. 6 and 7. When assembled/implanted, the inferior surface 20 of the bearing insert 14 makes slidable bearing contact with the superior surface 24 of the tibial tray 16. The curved surfaces 20 and 24 allow extra degrees of freedom (ie. translation and rotation in the mediolateral and anteroposterior planes) between the bearing insert 14 relative to the tibial tray 16. This results in the assembly 10 maintaining a larger contact area during more ranges of knee movement, which lowers contact stresses and leads to reduced component wear. Further, the assembly 10 also allows for full contact between the femoral component 12 and the bearing insert 14 during the condyler lift off (reportedly l-2mm) phase of gait. Tins improves the kinematics of the knee assembly 10 and decreases the amount of wear induced on the bearing surfaces 20 and 24. The curved surfaces of the femoral component 12 and the bearing insert 14 also provide an increase in the contact area between these components, thereby also decreasing stress magnitude.
Fig. 5 shows a second embodiment of a mobile bearing knee replacement assembly 40. Like reference numerals will be used to indicate like features to those shown in the first embodiment.
The assembly 40 is similar to the assembly 10 except the inferior surface 42 of the bearing insert 14' and the superior surface 44 of the tibial tray 16' are both curved in the mediolateral plane only. Accordingly, when viewed from the mediolateral side, the superior surface 44 of the tibial tray 16' appears identical to that shown in Fig. 2. However, when viewed from the anteroposterior side there is no curvature which results in the surface 44 being part cylindrical in shape, as shown in Fig. 4.
The second embodiment of assembly 40 possesses the advantages described above in relation to the assembly 10 except the curved surfaces 42 and 44 only allow translation and rotation in the mediolateral plane.
Another advantage of the assemblies 10 and 40 is that they avoid edge loading of the bearing inserts 14, 14' and the tibial trays 16,16' due to the relative movement (ie. translation as well as rotation) that the bearing inserts 14, 14' can make on their respective tibial trays 16, 16'.
Another advantage is that the additional degrees of freedom more closely replicate the natural kinematics of the knee and also allows some self correction of the positioning of the three components, particularly during compression of the knee. This is because, during compression and shear and torsional loading of the knee assembly, the bearing insert can follow the radius of curvature and translate as well as rotate relative to the tibial tray.
Another advantage of the assemblies 10 and 40 is that they represent only a relatively minor manufacturing change (ie. changing two flat surfaces to two curved surfaces) for existing component manufacturers and thus enables them to utilise existing: component geometry; bone fixation systems; and installation instrumentation.
Although the invention has been described with reference to preferred embodiments, it will be appreciated by a person skilled in the art that the invention may be embodied in many other forms. For example, in other embodiments (not shown), the curved inferior surface of the bearing insert and the curved superior surface of the tibial tray are not closely conforming in shape. Other metals can also be used for the femoral and tibial components as well as ceramic femoral components or coatings. Also, in other embodiments (not shown), the radii of curvature R, R' differ which results in the superior surface of the tibial tray being overall part ellipsoid in shape.

Claims

CLAMS:
1. A mobile bearing replacement knee assembly including: a tibial component having a convexly curved superior surface; and a bearing insert having a concavely curved inferior surface, wherein the curved surfaces of the tibial component and bearing insert are, in use, adapted for slidable engagement relative to each other.
2. The assembly as claimed in claim 1, wherein the curved surfaces of the tibial component and bearing insert are substantially conforming in shape with each other.
3. The assembly as claimed in claim 1 or 2, wherein the tibial component surface is curved in the mediolateral plane.
4. The assembly as claimed in claim 1, 2 or 3, wherein the tibial component surface is part cylindrical in shape.
5. The assembly as claimed in claim 1 or 2, wherein the tibial component surface is curved in the mediolateral and anteroposterior planes.
6. The assembly as claimed in claim 5, wherein the tibial component is part ellipsoid in shape.
7. The assembly as claimed in claim 5, wherein the tibial component is part spherical in shape.
8. The assembly as claimed in claim 1, 2 or 3, wherein the bearing insert surface is curved in the mediolateral plane.
9. The assembly as claimed in any one of claims 1 to 4, wherein the bearing insert surface is recessed part cylindrical in shape.
10. The assembly as claimed in claim 1, 2, 3 or 5, wherein the bearing insert surface is curved in the mediolateral and anteroposterior planes.
11. The assembly as claimed in claim 10, wherein the bearing insert surface is recessed part ellipsoid in shape.
12. The assembly as claimed in claim 10, wherein the bearing insert surface is recessed part spherical in shape.
13. A tibial component for a mobile bearing replacement knee assembly, the tibial component having a convexly curved superior surface.
14. The component as claimed in claim 13, wherein the tibial component surface is curved in the mediolateral plane.
15. The component as claimed in claim 13 or 14, wherein the tibial component surface is part cylindrical in shape.
16. The component as claimed in claim 13, wherein the tibial component surface is curved in the mediolateral and anteroposterior planes.
17. The component as claimed in claim 16, wherein the tibial component surface is part ellipsoid in shape.
18. The component as claimed in claim 16, wherein the tibial component surface is part spherical in shape.
19. A bearing insert for a mobile bearing replacement knee assembly, the insert having a concavely curved inferior surface.
20. The bearing insert claimed in claim 19, wherein the bearing insert surface is curved in the mediolateral plane.
21. The bearing insert claimed in claim 19 or 20, wherein the bearing insert surface is recessed part cylindrical in shape.
22. The bearing insert claimed in claim 19, wherein the bearing insert surface is curved in the mediolateral and anteroposterior planes.
23. The bearing insert claimed in claim 22, wherein the bearing insert surface is recessed part ellipsoid in shape.
24. The bearing insert claimed in claim 22, wherein the bearing insert surface is recessed part spherical in shape.
25. A mobile bearing replacement knee assembly including: a tibial component having a convexly curved superior surface; and a bearing insert having a concavely curved inferior surface, wherein the curved surfaces of the tibial component and bearing insert are, in use, adapted for slidable engagement relative to each other.
26. The assembly as claimed in claim 25, wherein the curved surfaces of the tibial component and bearing insert are substantially conforming in shape with each other.
27. The assembly as claimed in claim 25, wherein the tibial component surface is curved in the mediolateral plane.
28. The assembly as claimed in claim 27, wherein the tibial component surface is part cylindrical in shape.
29. The assembly as claimed in claim 25, wherein the tibial component surface is curved in the mediolateral and anteroposterior planes.
30. The assembly as claimed in claim 29, wherein the tibial component is part ellipsoid in shape.
31. The assembly as claimed in claim 29, wherein the tibial component is part spherical in shape.
32. The assembly as claimed in claim 25, wherein the bearing insert surface is curved in the mediolateral plane.
33. The assembly as claimed in claim 32, wherein the bearing insert surface is recessed part cylindrical in shape.
34. The assembly as claimed in claim 25, wherein the bearing insert surface is curved in the mediolateral and anteroposterior planes.
35. The assembly as claimed in claim 34, wherein the bearing insert surface is recessed part ellipsoid in shape.
36. The assembly as claimed in claim 34, wherein the bearing insert surface is recessed part spherical in shape.
37. A tibial component for a mobile bearing replacement knee assembly, the tibial component having a convexly curved superior surface.
38. The component as claimed in claim 37, wherein the tibial component surface is curved in the mediolateral plane.
39. The component as claimed in claim 38, wherein the tibial component surface is part cylindrical in shape.
40. The component as claimed in claim 37, wherein the tibial component surface is curved in the mediolateral and anteroposterior planes.
41. The component as claimed in claim 40, wherein the tibial component surface is part ellipsoid in shape.
42. The component as claimed in claim 40, wherein the tibial component surface is part spherical in shape.
43. A bearing insert for a mobile bearing replacement knee assembly, the insert having a concavely curved inferior surface.
44. The bearing insert claimed in claim 43, wherein the bearing insert surface is curved in the mediolateral plane.
45. The bearing insert claimed in claim 44, wherein the bearing insert surface is recessed part cylindrical in shape.
46. The bearing insert claimed in claim 43, wherein the bearing insert surface is curved in the mediolateral and anteroposterior planes.
47. The bearing insert claimed in claim 46, wherein the bearing insert surface is recessed part ellipsoid in shape.
48. The bearing insert claimed in claim 46, wherein the bearing insert surface is recessed part spherical in shape.
49. A mobile bearing replacement knee assembly including: a tibial tray having a convexly curved superior surface; and a bearing insert having a concavely curved inferior surface that substantially mirrors the tibial tray's convexly curved superior surface.
50. The assembly as claimed in claim 49, wherein the tibial tray surface is curved in the mediolateral plane.
51. The assembly as claimed in claim 49, wherein the tibial tray surface is curved in the mediolateral and anteroposterior planes.
52. The assembly as claimed in claim 49, wherein the bearing insert surface is curved in the mediolateral plane.
53. The assembly as claimed in claim 49, wherein the bearing insert surface is curved in the mediolateral and anteroposterior planes.
54. A mobile bearing replacement knee assembly including: a metal tibial tray having a convexly curved superior surface; and a plastic bearing insert having a concavely curved inferior surface that substantially minors the tibial component's convexly curved superior surface.
55. The assembly as claimed in claim 54, wherein the tibial tray is formed from Cobalt Chromium.
56. The assembly as claimed in claim 54, wherein the bearing insert is formed from polyethylene.
57. A mobile bearing replacement knee assembly substantially as described herein with reference to Figs. 1 to 4 and 6 and 7 or Fig. 5 of the accompanying drawings.
58. A tibial component substantially as described herein with reference to Figs. 1 to 4 and 6 and 7 or Fig. 5 of the accompanying drawings.
59. A bearing insert substantially as described herein with reference to Figs. 1 to 4 and 6 and 7 or Fig. 5 of the accompanying drawings.
PCT/AU2004/000075 2003-01-27 2004-01-21 A mobile bearing knee replacement assembly and a tibial component and a bearing insert therefor WO2004066882A1 (en)

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US44311803P 2003-01-27 2003-01-27
US60/443,118 2003-01-27

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US8029574B2 (en) 2006-11-07 2011-10-04 Biomedflex Llc Prosthetic knee joint
US8070823B2 (en) 2006-11-07 2011-12-06 Biomedflex Llc Prosthetic ball-and-socket joint
CN102596107A (en) * 2009-06-10 2012-07-18 肯特·M·塞缪尔森 Systems and methods for providing deeper knee flexion capabilities for knee prosthesis patients
US8308812B2 (en) 2006-11-07 2012-11-13 Biomedflex, Llc Prosthetic joint assembly and joint member therefor
US8512413B2 (en) 2006-11-07 2013-08-20 Biomedflex, Llc Prosthetic knee joint
US9005306B2 (en) 2006-11-07 2015-04-14 Biomedflex, Llc Medical Implants With Compliant Wear-Resistant Surfaces
US9005307B2 (en) 2006-11-07 2015-04-14 Biomedflex, Llc Prosthetic ball-and-socket joint
US9107769B2 (en) 2007-08-27 2015-08-18 Kent M. Samuelson Systems and methods for providing a femoral component
US9265615B2 (en) 2007-08-27 2016-02-23 Kent M. Samuelson Systems and methods for providing deeper knee flexion capabilities for knee prosthesis patients
US9566157B2 (en) 2006-11-07 2017-02-14 Biomedflex, Llc Three-member prosthetic joint
US9795487B2 (en) 2007-08-27 2017-10-24 Kent M. Samuelson Systems and method for providing a femoral full flexion articulation
US9872774B2 (en) 2007-08-27 2018-01-23 Connor E. Samuelson Systems and methods for providing a femoral component having a modular stem
US10213826B2 (en) 2007-08-27 2019-02-26 Connor E Samuelson Systems and methods for providing prosthetic components

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